** the metal plates under the three 3 watt LED's are needed for heat dissipation. If they are omitted, your LED's will over heat, pull more current, and burn out. 20oz tin can. Heat-shrink the 1Kohm resistor. As with all metal boxes, be sure to ground them. Polycarbonate will block IR, so be sure to use acrylic or glass. Acrylic is temp rated up to 300F +.